as important for romney is ohio, where he is under fire for ads suggesting u.s. automakers are about to ship jobs to china. >> obama took gm and chrysler into bankruptcy and sold chrysler to italians who are going to build jeeps in china. >> reporter: chrysler and gm angrily denied they are shifting u.s. production to china. and joe biden accused romney of lying and causing panic among autoworkers in ohio. >> thousands of them are calling their uaw reps, "is it true, is it true? is jeep really going to leave? is the announcement they made not true? are they going to shut down our plant?" what a cynical, cynical thing to do. >> reporter: but the romney campaign does see some positive signs out there, especially in pennsylvania, minnesota and michigan. three states that have been considered solidly democratic, but where the obama campaign is now suddenly playing defense, spending more than $1 million on tv ads for the final week. diane? >> also on the campaign trail, jonathan karl. thank you, jon. >>> and coming up here next, flammable gas leaking and it's not just a danger in the storm zone.